Shield can and blank therefor



March 6, 1956 c. E. SCHELL SHIELD CAN AND BLANK THEREFOR Filed March 30. 1953 FIG. I.

FIG. 3.

FIG. 2.

INVENTOR CHARLES E. SCHELI.

BY 4 Whalzu/fkj ATTORN United States Patent SHIELD CAN AND BLANK THEREFOR' Charles E. Schell, York, Pa., assignor to Sylvania Electric Products Inc., a corporation of Massachusetts Application March 30, 1953, Serial No. 345,275

3 Claims. (Cl. 220-62) This invention relates to metal cans and blanks therefor.

In particular the invention relates to an aluminum can such as one utilized to shield I.-F. coils in an electronic device and a blank out of which said can may be formed.

In the past it has been the practice to make such cans by drawing a portion of sheet material to shape by passing the same through successive dies and either concurrently with the drawing process or subsequently thereto punching out such openings in the can as necessary.

It is an object of this invention to simplify the manufacture of shield cans by stamping out a blank to proper shape, and with suitable openings, all in one operation and thereafter folding parts of the blank into abutting relation and interlocking other parts to secure a neat product. This can be accomplished by the use of simpler and less expensive machines than previously required.

For a fuller description of my invention, attention is directed to the following specification and accompanying drawings in which:

Fig. 1 is an isometric perspective view of the completed can,

Fig. 2 is a plan view of a blank utilized to produce the can of Fig. 1, and

Fig. 3 is a cross section through the can on the line 33 of Fig. 1.

in making the can, the first step is to stamp a blank 10, a plan view of which is shown in Fig. 2. The blank may be made of any suitable metal such as aluminum or copper of approximately in thickness for a can measuring approximately square by 1 /8" high. Obviously for cans of greater size, the thickness may be increased.

The blank comprises what will become three full width panels indicated as 12, 14, and 16, two half width panels indicated as 18 and 20 as well as two half end closures 22 and 24. The panels and end closures may be delimited by light score lines 26 impressed into the metal.

The sections 18 and 20 which will form the two half panels each have an extension along one of its edges. The extension 28 on the section 18 is for enfolding within the extension 30 which preferably is of a width substantially twice that of extension 28.- The wider extension may be scored longitudinally for ease in folding about the extension 28 so as to form the interlocked seam 30 of Fig. 1.

The sections 18, 14 and 20 have stamped out therefrom the openings 32, 34 and 36 as well as the slots 38, this being effected simultaneously with the formation of the blank. These openings and slots are intended to cooperate with fastening means to secure the can to a radio chassis. Furthermore, additional semicircular openings 40 may be provided in the half closures as Well as slots 42, these being provided for retaining mounting parts in the can and to provide for accessibility of frequency ad justing means.

ICC

After the stamping has been manufactured, it is next bent to the shape shown in Fig. 1, with the free edges 44 of the half end closures and the free edges 46 below the extensions in abutting relationship to each other to form a neat can having a smooth inner and outer surface, while the extensions are enfolded one within the other in a lock seam to form a securely held together can, the seam at the same time giving added stiffness-to the can structure.

Obviously, although I have shown my can as provided with special openings and slots to provide for mounting the can on a radio chassis and particular openings in the top of the can, these are not essential to my invention.

What I regard as my invention and what I claim is:

1. A can made of a single sheet of metal of appreciable thickness, said can being a rectangular parallelopiped with one end open, one vertical wall of the can having a joint therein formed in part by abutting edges of the metal sheet and in part by an interlocking seam, the top wall being formed in sections extending from opposite walls of the can toward each other in abutting relationship, openings in opposite vertical walls of the can, one of said openings being on that wall of the can having the abutting edges, part of the opening lying on one side of the abutting edge and part on the other.

2. A can made of a single sheet of metal of appreciable thickness, said can being a rectangular parallelopiped with one end open, one vertical wall of the can having a joint therein formed in part by abutting edges of the metal sheet and in part by an interlocking seam, the top wall being formed in sections extending from opposite walls of the can toward each other in abutting relationship, openings in opposite vertical walls of the can, one of said openings being on that wall of the can having the abutting edges, part of the opening lying on one side of the abutting edge and part on the other, said top wall sections being also provided with mating opening parts.

3. A can made of a single sheet of metal of appreciable thickness, said can being a rectangular parallelopiped with one end open, one vertical wall of the can having a ioint therein formed in part by abutting edges of the metal sheet and in part by an interlocking seam, the top wall being formed in sections extending from opposite walls of the can toward each other in abutting relationship, openings in opposite vertical walls of the can, one of said openings being on that wall of the can having the abutting edges, part of the opening lying on one side of the abutting edge and part on the other, with the opening between the two parts of the vertical joint.

References Cited in the file of this patent UNITED STATES PATENTS 426,000 Erb Apr. 22, 1890 1,206,839 Gruenberg Dec. 5, 1916 1,619,608 Fairchild Mar. 1, 1927 1,647,581 Redemski' Nov. 1, 1927 2,377,603 Belden June 5, 1945 2,483,412 Harker Oct. 4, 1949 2,639,311 Cook May 19, 1953 2,653,708 Spalding Sept. 29, 1953 2,682,018 Phillips June 22, 1954 FOREIGN PATENTS 473,885 Germany Mar. 23, 1929 

